Field-effect transistor device with partial finger current sensing FETs

A lateral semiconductor field-effect transistor (FET) device fabricated on a substrate includes a high-voltage main FET having interdigitated, elongated source and drain electrode fingers each of which is electrically connected to a respective interdigitated, elongated source and drain region disposed in the substrate. The FET device further includes first and second sense FETs each having a drain region in common with the high-voltage main FET. The sense FETS also include respective first and second elongated source electrode fingers each of which is electrically connected to respective first and second elongated source regions of the first and second sense FETs, respectively. The first and second elongated source electrode fingers are disposed length-wise adjacent to one of the elongated drain electrode fingers. The first elongated source finger has a first length, and the second elongated source finger has a second length, the second length being less than the first length.